LumaSense Technologies M310 - Manual (Page 32)

M310 Manual Appendix B: Calibration Methods 32
Example 3: The HT (450 C) blackbody was factory calibrated to provide effective emissivity =
1.0 at 8-14 µm. You wish to use this source for an imager that has spectral response of 3-5 µm.
The mean value between 3-5µm from the graph above = 0.943. The blackbody exit radiance at
3-5 µm will be approximately equivalent to a blackbody that has emissivity = 0.943. This will
cause your imager to receive 5.7% less infrared energy causing it to read a lower temperature.
The table below shows the expected radiance temperatures and errors. At 250 C, your imager
will read 245.5 or 4.5° low so you should set the blackbody setpoint to 254.5 = (250+4.5) to force
the exit radiance to be equal to 250 C at 3-5 µm.